Molding machine



Aug.

f. M. UDALE MOLDNG MACHINE Filed May l. N123 2 Shasta-@ham INVENTOR.

estema aug. ia, i924..

STANLEY in. Unai-JE, or DETROIT, MICHIGAN, AssIGNoE 'ro EARL HQLLEY', or

DETROIT, MICHIGAN.

MonDING nmoirnnl .application mea May 1e, 192e.. serial No. M9344.

To all whom it may cof/wem:

Be it known that I, STANLEY' M. UDALE,"

a citizen of Athe United States, residing at 393 Lothrop Ave., Detroit,inthe county of ;6 `Wayne and State of Michigan, have invented certainnew and useful improvements in Molding Machines, of which the followingis a specification.

This invention relates to molding machines, particularly those operatedby pneumatic pressure.

Figure I shows a cross, sectional elevation taken on the central plane.

Figure II shows a plan view showing the knock-out linkage and a partsection on plane X-Y of Figure I. Figure III shows an knock-out linkage.Description-The casting machine frame 1 supports two hollow metal molds2 and 3 by means of 'bolts 4 and 5 centrally located within the hollowmolds 2 and 3 and supported by the arms 6 and 7 of the frame 1.

The mold 2 is stationary, and held in place by its central bolt 4 andcap screws and lock nuts 42 and 43, 44 and 45.' The mold 3 is slidablysupported on an arm 7 of the frame 1 by means of the bolt ,5 which isend view of the locked to the piston 8. This piston 8 recip-` rocates inthe cylinder 9 which may be cast integral with the casting 1. The mold 3is opened by means of the coil spring 10 located within the cylinder 9.The spring l0 presses the piston 8 up against the cylindrical cover 1,1,which is bolted by means of a iiange to the cylinder 9 which is castintegral with the frame 1.

Compressed air is supplied and regulated by the following means; Aplatform 12 con- ,40 tacts with the bell crank lever 13 pivotly mountedon the frame 1 by means of the pin 14. The bell crank lever 13 engageswith the spring closed valve 15 which is ar-` ranged in the valvehousing 16, to which a supply of compressed air is connected.' A pipe 17is threaded into -the outlet of the valvecasing 16 and conveyscompressed air to the elbow 18, which elbow is threaded into theextension 19 of the cylinder 9. A spring loaded relief valve 20 isprovided in the ex- A21` and casting 9.

`The link 30-33 operates the plate 29, being serves as a stop so'that asthe hollow mold tension 19of the cylinder 9. The spring 23. normallykeeps the relief valve 20 Slightly open and engages with the valvesupporting it in place so that the valve is held to a de ii nite minimumopening. s This spring 2l is `55 bolted to the cylinder 9 by meansof thecap screw 22, and the exact opening of the relief valve 20 is determinedby selectingthe correct thickness of washer between the spring' co .Anadjustable leak valve or vent 23 'is pro. v' vided in the cylinder cover11 and the'area of .this outlet' 23 is regulated by the valve 24. A-casting 46 is bolted to the cover4` l1' Y and a pipe 47 connects thevent or -outlet 23 05 with a casting 48 bolted to the'stationary mold 2,see Figure 1I. This casting clamps a temperature responding metallic.-element lare provided. The knock-out pins 2 7 and 28 are operated by theknockout pla-te 29.

hinged thereto by means of the pins 3l an 32. A.: link 34 connects thelink 36 `with the stationary mold 2, a pin 35 being rovided therefor.vThe bar 36` is provide with a slot 33 which engages with a pin 37 inthe steeltube-38, which is guidedin a projection from lshe stationarymold 2 and also by a projection from the cylinder 9 and movable mold 3.

The piece 39 is fastened to the'tube 38 and 3 moves to the left the rod38 is carried with it' and thus' the link\ 30 is moved,.thereby movingthe plate 29 and the knock-out pins 27 and 28 (Figure l). A spring 55tends `to return the knoclcout pins 27 and 28 tol vtheir originalposition or pouring' When mold-3 moves to the right into the pouringposition. The ejection means for the stationary mold are the equivalent'of those/'100.-

means shown, described and claimed in the co-pending application of-AlexAnderson, serlal No 617,042, filed 5 February 1923.

0peratimLAssuming that a supply of compressed air is available throughthe open ing to 16, when the weight of the operator, that is 'to'say theweight of the man plus the weight of the ladle of iron, comes onto theplatform 12 the bell crank lever 13 opcns the valve' 15, therebyadmitting compressed air through the pipe 17, elbow'18, into the chamber19. This compressed air immediately closes the valve which is heldslightly open by a light spring 21. The pressure 1nside the cylinder 9above the piston 8 immediately builds up and the mold 3 moves quickly tothe right closing the mold so that it is now ready for pouring. Themetal 1s .then poured into the mold and the operator steps off theplatform 12.

-The spring loaded valve 15 lmmedlately 'i closes and the compressed.air within the cylinder 9 escapes through the vent 23, pipe 47,fixe'dgoutlet 57, and also past the temperature controlled valve 53..When the pressure in the cylinder 9 drops to a predetermined pressurethevalve 20 opens under the influence of spring -21 and the pressure withinthe cylinder 9 is released quickly. The spring 10 then drives `thepiston l8 back so vas to release the casting from the mold`,\ Theknock-out pins 25 and 26 strike the upright piece 7 and thereby ejectthecast- .ing from the mold. Meanwhile the mold 3, (Figure II) strikes thepiece 39-and so carries the tube 38 to the left through the linkotherage shown.` The knock-out are thus .also moved to the le so that if thecasting should hang onvthe mold 2 it will be ejected by meansoffthefknock-out pins 27 and 28 therein.

y In order that the molds should face each properly without any leakagethe die Fins 27 and 28 straighteners 42-43 44-45 are applied toA themold 2 so that by tightening up on the bolt 4 the tendency of the moldface to become convex can be counteracted. Two or three long threadedbolts similar to 40 and the lock nut 41 are provided on the mold 3 for asimilar pur ose. Dowels 58, 59 and 60 are also provi ed to ensure theproper alignment of the two molds with each other. u

ring the period whenl the molds are l being raised to their Workingtemperature,

that is to say duringthecastmg of the first fewl castings, 1t is .tneither necessary nor n desirable to retain the castings within themoldsyas the cold molds`are apt to chillthe castings.

,",Durmg-,Tthe.continuous operation of the machinewthe .temperature ofthe mold in- Acreases and therefore, a.y greater period of .a vtimefisrequired z-.for

the iron to glve up its heat to the mold, the flow of heat froml themolten iron through tl/ie`walls of,the

casting comprising the mold is slower as the temperature of the moldincreases. It follows that molds must beheld closed for a longer periodof time in order that when the castings are ejected they are completelysolid. ln order to )rolong the period during which' the molds are keptclosed it is necessary therefore to impede the flow of the compressedair through the adjustable vent The temperature responding element 49,by its connection to the valve 53, does this by gradually closing thevalve 53. .The small hole 57 constitutes the limiting vent so that theoutlet is never entirely shut otl, so that when the molds have 4reachedtheir Working temperature the valve 57 is closed and there is no openingother than the small outlet 57.

'What I claim is:

l.` In a pneumatic molding machine comprising a pair of molds adapted toreci rocate back and forth relative to each ot er, means for supplyingcompressed air for the purpose of closing said molds, elastic means foropening said molds, means for cuttin off the sup ly of compressed air,an a justable lea valve whereby the molds are opened automatically apredetermined period after the supply of compressed air is cut off.

2. In a pneumatic molding machine comprising a pair of molds adapted toreci rocate back and forth relative to each ot er, means for supplying.compressed air for the purpose of closing sald molds, elastic means forY opening said molds, means for cutting off the supply of compressedair, an adjustable leak va ve, an automatic relief valve,

4whereby the molds are opened rapidly a predetermined period after thesupply of compressed air 1s cnt oil' when the ressure of the air fallsto a predetermine ligure.

8. ,In a prlsmg a which is a to a piston,

pair of matching molds one of apted to slide and is connected a cylinderin which said piston slides, Imeans for supplying compressed air to saicylinder for purpose of sliding the said mold into engagement with theother, means for cutting off the supply of compressed air, a lea valve,a temperature responding element in thermal relationship .with one ofsaid molds controllin I the flow which the compressed a1r 1smtermlttently admitted pneumatic molding machine eo A by the air pastthe rst miv@ to thc air means, a leak 1s automaticaii 5. En .a pneumaticmcdin arising msichiiig mcids,'

prcssum from said cir pressure .means opciicr. suquczit to the c closingof the' rst valve.

g machines ccmmg means 'misi leak from sai @www l.

atmosphre, a rclie 'viilvc adapted to opc 15 when thc pi'essurc fails toii predcteiminc figure Whcrcby thc mokis are quickly opened :ipredetermined pcricd of time af'cg the supply of compressed cir is shuiI@if under hc action of the yielding means.

ln 'iestimony whereof ax my signaturc STANLEY M. UEDALE.,

